Former Owner
- Peter Arrell Brown Widener1
- Peter Arrell Brown Widener II1
- Petrus Hofstede1
- Petrus Jensenius1
- Petrus Ysermans1
- Philadelphia Rare Books & Manuscripts Company1
- Philip Hofer1
- Philip Jacob Grangier1
- Philip van Alfen1
- Philippe de Béthune1
- Pierre Picard le Jeune1
- Prince Augustus Frederick, Duke of Sussex1
- Québriac family1
- René Antoine Thoué1
- Ricardo, Conde de Benahavis Heredia1
- Richard Blount1
- Richard Linenthal1
- Robert Charles Winthrop1
- Robert H. Sayre1
- Robert Lehman1